Created attachment 874527 [details]
y2logs.tar.xz

Environment: a s390x (zSystems) VM on the LinuxOne community cloud
(https://linuxone.cloud.marist.edu), originally SLE 15 SP4, upgraded to
Tumbleweed.

To automate the Tumbleweed updates, I enabled os-update, which basically calls
zypper dup -y --auto-agree-with-product-licenses

This automated update worked on 2024-04-04.

For some (so far unknown) reason, the automated zypper dup on 2024-04-26
uninstalled lots of packages, including quite some base packages (for example
sudo, less, vim, file, shadow), and left the system in a half-broken state. At
least ssh login and su still worked. After re-creating /etc/resolv.conf and
reinstalling the removed packages, I could get some logs and fix the system.

(I had a similar breakage on another VM some months ago, but back then, I
didn't know the root password and therefore couldn't collect logs.)


An interesting detail is that zypper asked me to trust a key today:

# zypper ref
Repository 'repo-openh264 (%{distver})' is up to date.

New repository or package signing key received:

  Repository:       repo-oss (%{distver})
  Key Fingerprint:  F00C 20EF 1E11 14C9 B5F6 9B22 76CA 4244 F6AB 3975
  Key Name:         openSUSE:Factory:zSystems OBS Project
<openSUSE:Factory:zSystems@build.opensuse.org>
  Key Algorithm:    RSA 2048
  Key Created:      Tue 02 Aug 2022 11:09:47 PM EDT
  Key Expires:      Thu 10 Oct 2024 11:09:47 PM EDT
  Rpm Name:         gpg-pubkey-f6ab3975-62e9e6fb


That might already be a hint what caused the removal of the packages.
If I
    zypper mr -d openSUSE:repo-oss
    zypper dup
it proposes to delete 108 packages - and on a quick look, the list looks
similar to what was removed automagically.

My _guess_ is that the missing key had a similar result as disabling the repo.
Still, even "zypper dup -y" should error out if a repo is signed with an
unknown key, instead of silently disabling the repo and removing seemingly
"orphaned" packages.

I'll attach the y2logs so that you can check if my guess is correct ;-)